Responsive bugs rarely announce themselves at the desktop breakpoint.For this concept audit, I treated the landing page as an evidence trail rather than a cosmetic before-and-after:— breakpoint defects marked with redlines— overflow and contrast issues separated from layout noise— keyboard focus checked alongside visual hierarchy— every finding recorded in a compact QA ledger with a clear statusThe signature element is the red inspection trace. It connects each finding to the viewport and interface detail where the defect appears, so the recommended fix is reproducible rather than subjective.This is self-initiated concept work built with synthetic content, not a client result. It demonstrates the process I use for focused landing-page audits and responsive fixes.Case study: https://contra.com/p/sUb7M6oY-concept-breakpoint-evidence-and-landing-page-qa